From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Test report from the Montlhéry track with a Cadillac, detailing maximum speed and acceleration data.
| Identifier | ExFiles\Box 125\2\ scan0137 | |
| Date | 7th November 1934 | |
| 41729 To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} From GWH.{George W. Hancock - Head Chateauroux} 7th November 1934. TEST ON MONTLHERY TRACK WITH CADILLAC. ESSO petrol. MOBILOIL "D". Driver and one passenger. Tank half full. Maximum speed five laps. 1st lap. 1 minute 4 1/5 second = 142.891 Kms. per hour. 3nd " 1 " 4 1/5 " = 88.88 MPH. 5th " 1 " 4 1/5 " Maintained 60 MPH. on speedo. Lap time 1 minute 43 2/5 seconds = 88.72 Kms. per hr. = 55.45 MPH. Standing start through gears to 80 MPH. speedometer. 33 seconds. 30 " 30 " ACCELERATION. Speedometer M.P.H. Seconds. Top gear. 10 - 20 4 20 - 30 4 30 - 40 4 1/5 40 - 50 4 50 - 60 4 60 - 70 5 70 - 80 6 1/5 Top gear. 10 - 30 7 3/5 10 - 40 11 10 - 50 15 3/5 10 - 60 19 1/5 10 - 70 25 3/5 10 - 80 30 3/5 | ||